What are you actually referring to? A stock being suspended and be sent to the greys? A company that didn't do anything wrong and be suspended by the SEC for reasons they only know, because they had concerns? A company whose stock was suspended from trading because a third party, I.e., someone that has no connection with the direct workings of the company, was planning some sort of manipulation of company, but maybe gave the SEC the heads up of their narfarious intentions?
What exactly are you asking if anyone has seen this before? I've most likely seen all three.